Assig-noe



(No Model.) l v O. D. WARFIELD.

LATHB DOG. A

Patented.Apr.` 29, 1884.

UNITED STATES]u PATENT OFFICE.

OLIVER WARFIELD, OF CHICOPEE FALLS, MASSACHUSETTS, ASSIGNOR p TO CHARLESH. WOOD, OF PROVIDENCE, RHODE ISLAND, AND EDWARD E. HOLTON, OF CHICOPEE,MASSACHUSETTS.

LATH E-DOG.

SPECIFICATION forming partv of LetteraV Patent No. 297,884, dated April29, 1884. Application tiled July 16, 1883. (No model.)

To all whom/'it may concern: into the short portion of Vthe hole ofsmallest 5o Be it known that I, OLIVER D. WARFIELD, diameter in theshank, and secure it therein, of Chicopee Falls, in the county'ofHampden preferably, by a small projecting stud, 11, and State ofMassachusetts, have invented a made on the end of the shoe, and forcedsnugly new and useful Improvement in Lathe-Dogs, into `a hole made inthe end of the rod 9, as

of which `the following is a' specification and shown clearly in Fig.II. By this construc- 55 description. -1 tion I am enabled to extend theexposed end The object of my invention is to provide a of the shoe thewhole width of the shank dog for holding work in a lathe, into which tofurnish a good bearing for the material to 1o the work may be easily andquickly secured be operated upon when secured in the eye of without theuse of a wrench, and in which it the dog, and 'as the stud 1l of theshoe ts 6o will be held securely while being'operated snugly the hole inthe end of the rod, and is upon, and I accomplish this by themechanforced therein, and as said rod is larger in ism substantially ashereinafter set forth, and diameter than the socket to receive the shoe,illustrated in the accompanying drawings, in the latter cannot drop outof its socket when whichy the dog is held with the lever 2 uppermost. 65

Figure I is a front view of my invention. The rod 9 and shoe 10 might,however, be i Fig. II is a longitudinal section at line A of made of thesame diameter, and a small part Fig. I. Fig. III is a longitudinalsection of a of the shoe be flattened on one side, and a small 2oportion of the dog, showing a modification of pin inserted transverselythrough the shank,

the same. Fig. IV is a front view of a dog as shown at in Fig. IV, thisbeing a well- 7o made according to my invention, with an ecknown meansof limiting the movement of a centric lever' made separate from the mainrod. The pivoted end of the lever 2 is made portion of the dog; and Fig.V is a longitudieccentric at 12 with reference to the pivot 3, nalsection of a portion of the dog at the bent that part of the leverbetween its edge and arm, and showing the eccentricand the shoe. thepivot being thicker than that between its In the drawings, 1 representsthe shank. 5 circular end 12 and the pivot, so that when represents theeye; 16, the head; 4, the adjustthe lever 2 is moved into a positionshown in ing-screw turned through a threadedV hole dotted lines in Fig.II the edgeof the lever, 3o made longitudinally through the head; and 2impinging against the end of the rod 9, forces represents the cam oreccentric lever pivoted it into the shank and the exposed end of the 8obetween the ears 17 at the end of the shank shoe farther into the eye 5.Y

opposite the head. V I make a hole longitudi- 'Io secure the stock to beoperated upon in nally through the shank 1, and insert therein the dog,the screw 4 is turned out, so that the 3 5 a rod, 9, which may be made alittle longer stock may be inserted in the eye 5 between the than thehole through the shank, so as to proend of the screw and the grooved endof the 8 5 ject therefrom a little between the ears 17, and shoe, andthe screw may be then turned in to project at the other end a shortdistance vagainst the stock firmly with the fingers, and into the eye 5,with a V-shaped groove across the lever 2 being then moved into theposition 4o the end of the rod, as at 6, into or against shown in dottedlines, the shoe is firmly forced which the work is to be forced by thescrew 4 against the stock, and it is held between the 9o in securing thework in the eye. shoe and the screw with sufficient force to'be Insteadof making the rod 9 all in one piece, operated upon in a lathe byplacing the dog in I prefer, in practice, to make the hole in the theface-plate in the usual manner, the lever 45 shank, for nearly its wholelength, of one di- 2 forming the ordinary arm'of the dog.

ameter, and make a short portion, near the In Figs. IV and V is shown amodification eye 5, of a little smaller diameter, .and makof theinvention, in which the cam-lever is ing the rod 9 a little longer thanthe hole of pivoted in the shank at a point nearer the largest diameter.I then insert a shoe, 10, shoe 10, and whose end, extending through ahole in the shank for a short distance in from each side of the shank,has a bearing at 13 in said hole, and forms the pivot on which the leverturns. A portion of this pivot end of the lever is made eccentricopposite the inner end of the shoe at 14, the latter being made ashereinbefore described, and as shown in Figs. I and II, and beingprevented from dropping out of place by the pin 20, as before mentioned.In this modification, Vwhen the lever is moved into a position extendingin the opposite di rection from that shown in Fig. IV, the shoe l() maybe forced in toward the eccentric end of the lever, and the stock maythen be placed in the eye 5 and the screw t turned in against it, andwhen the lever is turned into the position shown in black lines in Fig.IV the shoe will be forced more firmly against the stock and the latterbe secured to be operated upon in the lathe. In this modication the armof the dog, by which it is secured in the face-plate of the lathe, ismade solid, as shown at 1.5 in Figs. IV and V.

Although the head of the screw 4 is inade prisniatic, or four-sided, asshown in the drawings, in order that a wrench may be used, if desired,this feature is not essential, because one of the objects of theinvention is to dispense with the necessity of using a wrench insecuring work in and removing it from the dog. The wrench is oftenmislaid, and no inconsiderable amount of time is often wasted byaworkmau in looking for a misplaced wrench with which to secure thestock in or remove it from the dog. By the use of this invention it isquickly and easily secured or removed by the fingers, and entirelywithout any necessity of using a wrench.

'That part'of thc'device'which is provided with a Vshapcd groove, andagainst which the stock has a bearing when secured in the dog, Idenominate the shoe,7 whether it extends entirely through or onlypartially through the shank in a longitudinal direction, and whethermade in one piece or two. rIhe only advantage of making the shoe in twoparts is that in dogs ofthe smaller sizes the shoe, if made in a singiepiece, would have to be insert-ed into its socket from the end where thelever 2 is pivoted to the shank, and the grooved end of the shoe couldnot be of larger diameter than the socket itself. Therefore a largerbearing at the grooved end of the shoe may be obtained by making theshoe in two parts and inserting the shorter part into its socket fromthe eye of the dog, and the other part from the other end, and forcingthem together. In larger dogs, for heavy work, however, Where the shankis made larger, a suiiciently large bearing at the grooved end of theshoe may he obtained by making it in a single piece and inserting intothe socket at the end in which the lever 2 is pivoted, as shown in Fig.III.

Having thus described my invention, what I claim as new is# In animproved lathe-dog, the combination of an adjusting-screw turned intoone end of the dog, with its threaded end proj ectinginto the eye oropening which receives the work, a movable shoe located in asocket onthe other side of the eye, and a cam-lever pivoted in the shank to forcesaid shoe toward the adjustingscrew, substantially as described. OLIVERD. VARFIELD.

- XVitiiesses:

T. A. Gnarls, CHAs. H. Woon.

